New answers tagged filter
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Trouble with filter using Laplace transfer function in LTSpice
First off, just save yourself a lot of grief and always set \$\omega_{_0}=1\$ and just use the given polynomials. The shape determines everything, not the location on the frequency axis. So just give ...
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Trouble with filter using Laplace transfer function in LTSpice
I suppose that the mentioned frequency (f=3.5 kHz) is the desired 3dB-frequency (your requirement), right?
In this case, it is not true that the corresponding w value (2Pi*f) would appear in the ...
- 25.7k
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Accepted
Find resistors for an inverting op amp band pass filter
The input pair of components create a high pass filter, the feedback pair of components create a low-pass filter.
Using f(-3dB)=1/(2 * pi * R * C) for each pair of components (input pair and feedback ...
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How do you chain 2-port S-parameters onto a 1-port S-parameter?
From Wikipedia (or pretty well any rf/microwave text covering S-parameters):
https://en.wikipedia.org/wiki/Scattering_parameters
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Do I need to add a filter for an isolated DC-DC converter?
The test configuration is a circuit that is used to test the performance of the DC-DC converter under controlled conditions. It is not necessary to use the test configuration for normal operation of ...
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0
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Accepted
How can I calculate the parameters of an inverse Chebyshev active filter?
Quote: "LvW I don't know how the values of these resistors and capacitors are determined"
Well - you must apply the classical method which is to be used for all second-order stages:
Select ...
- 25.7k
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Non-standard low-pass filter design
Here is a Maple resolution of the circuit.
You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
...
- 11.9k
5
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Accepted
strange phase behavior RC low pass filter
Electrolytic capacitors have fairly large ESR values, and they're fairly constant across frequency. As the reactive impedance drops according to frequency, the total impedance becomes dominated by ...
2
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Non-standard low-pass filter design
Is this a practical filter configuration?
A standard 3rd order filter with a gain of unity that uses an op-amp would use 3 resistors and 3 capacitors. Your circuit uses 5 resistors and 4 capacitors. ...
- 443k
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How to filter a noisy PWM signal without affecting rise and fall times
What filter would you recommended to clean this signal without affecting the rise and fall times of the PWM (such as a LPF would do)?
Do you simply need to measure the frequency and duty ratio of the ...
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How to filter a noisy PWM signal without affecting rise and fall times
You should be able to filter out the high frequency component fairly easily, since it's an order of magnitude higher than your signal of interest.
Your signal is 88Hz, maybe up a couple hundred if you ...
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3
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How to filter a noisy PWM signal without affecting rise and fall times
What filter would you recommended to clean this signal without affecting the rise and fall times
Mathematically, it's impossible to do this with a linear filter, as a sharp edge has an infinite ...
- 90.3k
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Discrepancy Between Bode Plot Predictions and FFT Output for Higher-Order Low Pass Filters on a 10 kHz Square Wave
Three of your plots have a 20dB/decade slope of the baseline, the three that went through your filter simulation. This baseline is obscuring what's happening to the harmonics, that will actually be ...
- 162k
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Transistor specs in the capacitance multiplier
Also, I'm having trouble determining what specs should the transistors have, like maximum collector current, power dissipation, etc.
A very common industry rule of thumb for long-term reliability, ...
- 18.1k
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Transistor specs in the capacitance multiplier
What depends on beta, is mostly the output impedance. As you have a constant load, this is not a concern.
What is a concern however, is that your circuit provides no low frequency PSRR at all. So ...
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Transistor specs in the capacitance multiplier
Your concerns are reasonable. Realistic values can be input by selecting a library model file, or downloading and importing one. If you need help, check the manual or get support for your simulator.
...
- 27k
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Input Filter for Current Sense Amplifier - ODrive
can anyone explain to me why the input filters for the current sense amplifiers in the old ODrive schematics are unbalanced
Short answer - they are already balanced by internal resistors, Figure 6 (...
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Input Filter for Current Sense Amplifier - ODrive
It's hard to say without having a link to the chip spec, but I suspect it's because SP1 and SP2 are already connected to ground. R25 and C36 (for instance) probably serve to filter high frequency ...
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Incorrect cutoff frequency using two Sallen-Key filters to build a bandstop filter
My analysis of the filter is as follows (see photo):
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